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Finding the Fourth Proportional to 57.10, 85.70 and 34.29

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Solution

The fourth proportional to 57.10, 85.70 and 34.29 is: 51.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.10 : 85.70 = 34.29 : x
  2. Step 2: Convert to fraction form
    57.10/85.70 = 34.29/x
  3. Step 3: Cross multiply
    57.10x = 85.70 × 34.29
  4. Step 4: Simplify right side
    57.10x = 2,938.65
  5. Step 5: Solve for x
    x = 2,938.65/57.10
  6. Step 6: Final answer
    x = 51.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.